This is a very important issue. A review of 60 studies reveals conclusively that children have better outcomes with joint physical custody (shared parenting) than without.

https://www.researchgate.net/publication/324598281_Joint_Versus_Sole_Physical_Custody_Children's_Outcomes_Independent_of_Parent-Child_Relationships_Income_and_Conflict_in_60_Studies

The old model of every other weekend visitation has been proved inadequate. The reasons for this can be debated, but the outcome cannot. And yet, many states are still struggling to institute laws that presume shared parenting.

https://en.wikipedia.org/wiki/List_of_shared_parenting_legislation

These laws have a "rebuttable presumption" of shared parenting. That means that if one parent is demonstrated to be inadequate, they can lose their parenting right. But in the absense of such evidence, shared parenting is the rule.

These laws are one step in the ongoing struggle to reframe gender roles away from men being providers and women being caregivers, towards an egalitarian understanding.

Feminists and male advocates ought to be able to work together against traditionalist opposition to pass these bills in every state and around the world.